Image via Wikipedia
If you put raisins in a glass of carbonated water (or, as in this video,
Sprite), they'll bounce up and down. Why? The raisins' wrinkles
capture the carbon dioxide bubbles, which in turn bring the raisins to
the top of the glass. The bubbles escape when they hit the surface, so
the raisin falls again -- only to repeat its travels. A similar thing
happens with pomgranate seeds in champagne, as seen here.
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